Электронный каталог

22.6
M73
Minglibayev, M. Zh.
    Differential equations of the planetary systems. [Текст] / M. Zh. Minglibayev, A. B. Kosherbayeva // Reports of the National Academy of Sciences of the Republic of Kazakhstan. - 2020. - №2. - P. 14-20
ББК 22.6

Рубрики: astrophysics

Кл.слова (ненормированные):
non-stationary star -- planetary systems -- variable mass -- the many -body problem -- osculating elements
Аннотация: In this article will be considered many spherical bodies problem with variable masses , varying non-isotropic at different rates as celestial -mechanical model of non-stationary planetary systems.
Держатели документа:
WKU
Доп.точки доступа:
Kosherbayeva, A.B.

22.161
K13
Kadirbayeva, Zh. M.
    An Algorithm for solving a boundary value problem for essentially loaded differential equations. [Текст] / Zh. M. Kadirbayeva, E. A. Bakirova, A. Sh. Dauletbayeva, A. A. Kassymgali // News of national academy of sciences of the republic of Kazakhstan. - 2021. - №2. - P. 6-14
ББК 22.161

Рубрики: differential equations

Кл.слова (ненормированные):
essentially loaded differential equation -- numerically approximate method -- algorithm
Аннотация: This research is funded by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan.
Держатели документа:
WKU
Доп.точки доступа:
Bakirova, E.A.
Dauletbayeva, A. Sh.
Kassymgali, A.A.

22.1
D25
Dauylbayev, M. K.
    Asymptotic expansion of solution of bvp with initial jumps for singularly perturbed integro-differential equation. [Текст] / M. K. Dauylbayev, N. Atakhan, n. Asset // News of national academy of sciences of the republic of Kazakhstan. - 2021. - №4. - P. 40-49
ББК 22.1

Рубрики: Mathematica

Кл.слова (ненормированные):
singular perturbation -- small parameter -- the inital jump -- asymptotic expansion -- the boundary layer
Аннотация: We consider the undivided boundary value problem for singularly perturbed linear integro-differential aquations of n-th order with integral Fredholm terms, which has the phenomenon m1-th order of an initial jump of order at the left end of the segment under consideration.
Держатели документа:
WKU
Доп.точки доступа:
Atakhan, N.
Asset, n.

38.3
S70
Sokolova, Ya. А.
    The study of the properties and structure of cement binding composition on electrolyte acqueous solutions activated by mechanomagnetic method. [Текст] / Ya. А. Sokolova, M. V. Akulova, B. R. Isakulov, А. G. Sokolova [et al.] // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №2. - P. 86-91
ББК 38.3

Рубрики: Строительные материалы

Кл.слова (ненормированные):
Cement compositions, -- mechanomagnetic activation -- electrolyte aqueous solutions -- differential thermo gravimetric analysis -- compressive strength -- structure formation of binders -- sodium thiosulphate -- calcium chloride
Аннотация: In the present paper, the issues of studying the influence of complex activation of grouting fluid on the structure and properties of the hardened cement paste and concrete are considered. The problem is relevant for manufacturing of building materials. In the paper, there was used the method of applying in the concrete mix composition of the elementary chemical substances undergone special physical treatment by means of mechanomagnetic activation. For more profound study of the structure formation processes in the hardened cement paste, the method of differential thermo gravimetric analysis has been used. As the research results have shown, the concrete samples on the activated electrolyte solutions are characterized by improved strength. In addition, on the base of differential thermo gravimetric analysis, it was proven that in the studied samples of the hardened cement paste on the electrolyte solutions activated by the method of mechanomagnetic treatment, the less calcium hydroxide and the more hydrated calcium silicate with amorphous and fine crystalline is formed. The obtained results for cement composites could be applied when manufacturing effective binder for concretes and mortars in the production of building materials and structures.
Держатели документа:
WKU
Доп.точки доступа:
Akulova, M.V.
Isakulov, B.R.
Sokolova, А.G.
Kul’sharov, B.B.
Isakulov, А.B.

33
R24
Rasulov, S. R.
    Hydrodynamic features of suspensions and emulsions flows. [Текст] / S. R. Rasulov, G. R. Mustafayeva // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №2. - P. 99-104
ББК 33

Рубрики: Горное дело

Кл.слова (ненормированные):
hydrodynamics -- differential equation -- suspensions -- emulsions -- dispersed phase -- solid spherical particle -- turbulent flow -- pulsating motion
Аннотация: This scientific article is devoted to the problems associated with the flow of suspensions and emulsions and some simplifications of the real picture of the flow of a polydisperse medium are made. It is also stipulated that differential equations characterizing the motion of suspensions and emulsions should take into account the fundamental discontinuity of the medium and the physicochemical processes of heat and mass transfer occurring in it. Taking into account all these factors, a general equation for multiphase systems is proposed with certain simplifications that do not change.
Держатели документа:
WKU
Доп.точки доступа:
Mustafayeva, G.R.

22
S 53
Shaikhova, G. N.
    Traveling wave solutions for the extended modified korteweg-de vries equation [Текст] / G. N. Shaikhova, B. K. Rakhimzhanov // Вестник национальной инженерной академии Республики Казахстан. - 2021. - №4. - с. 197-203
ББК 22

Рубрики: Физико-математические науки

Кл.слова (ненормированные):
extended modified Korteweg-de Vries equation -- sine-cosine method -- ordinary differential equation -- partial differential equation -- nonlinearity
Аннотация: In this paper, we study an extended modified Korteweg-de Vries equation, which contains the relevant higher-order nonlinear terms and fifth-order dispersion. This equation is the extension of the modified Korteweg-de Vries equation and described by the Ablowitz-Kaup-Newell-Segur hierarchy. The standard Korteweg-de Vries equation is the pioneer integrable model in solitary waves theory which gives rise to multiple solition solutions. The Korteweg-de Vries equation arises naturally from shallow water, plasma physics, and other fields of science.
Держатели документа:
ЗКУ им М. Утемисова
Доп.точки доступа:
Rakhimzhanov, B. K.